Gurobi 5.0.1 (linux64) logging started Tue Nov 20 05:48:49 2012

Optimize a model with 343 rows, 81 columns and 686 nonzeros
Presolve removed 106 rows and 0 columns
Presolve time: 0.00s
Presolved: 237 rows, 81 columns, 560 nonzeros
Variable types: 0 continuous, 81 integer (81 binary)
Found heuristic solution: objective 26.0000000

Root relaxation: objective 3.112903e+01, 133 iterations, 0.00 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0   31.12903    0   75   26.00000   31.12903  19.7%     -    0s
     0     0   30.32432    0   79   26.00000   30.32432  16.6%     -    0s
     0     0   30.21166    0   80   26.00000   30.21166  16.2%     -    0s
H    0     0                      27.0000000   30.21166  11.9%     -    0s
     0     0   30.04430    0   78   27.00000   30.04430  11.3%     -    0s
     0     0   29.94472    0   79   27.00000   29.94472  10.9%     -    0s
     0     0   29.84926    0   76   27.00000   29.84926  10.6%     -    0s
     0     0   29.71498    0   79   27.00000   29.71498  10.1%     -    0s
     0     0   29.64474    0   76   27.00000   29.64474  9.80%     -    0s
     0     0   29.56884    0   77   27.00000   29.56884  9.51%     -    0s
     0     0   29.51879    0   77   27.00000   29.51879  9.33%     -    0s
     0     0   29.51575    0   77   27.00000   29.51575  9.32%     -    0s
     0     0   29.51575    0   77   27.00000   29.51575  9.32%     -    0s
     0     2   29.51575    0   77   27.00000   29.51575  9.32%     -    0s
*   13     1               4      28.0000000   29.09091  3.90%  31.1    0s

Cutting planes:
  Clique: 2
  Zero half: 31

Explored 15 nodes (936 simplex iterations) in 0.07 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 2.800000000000e+01, best bound 2.800000000000e+01, gap 0.0%